#include <iostream>
#include <cctype>
using namespace std;
 
int Y(char string[], int ctr, int vowel);
int length = 0;
int vowel = 0;
 
int main()
{
    char string[50] = "";
    cout << "Please enter a string of 50 characters or less: ";
    cin.getline(string, 50);
    length = strlen(string);
 
    for(int ctr = 0; ctr < length; ctr++)
    {
        string[ctr] = tolower(string[ctr]);
 
 
        if(string[ctr] == 'a' || string[ctr] == 'e' || string[ctr] == 'i' || string[ctr] == 'o' || string[ctr] == 'u')
        {    
            vowel++;
 
            if(string[ctr] == 'y')
            {    
                vowel = Y(string, ctr, vowel);
            }
        }
 
        if(string[ctr] == ' ')
        {
            vowel++;
        }
 
    }
    cout << "\nThe string you entered was: "<< string << endl;
    cout << "You entered " << (length - vowel) << " consonants in that string." << endl;
}
 
int Y(char string[], int ctr, int vowel)
{
    bool flag1 = false;
    bool flag2 = false;
    if(string[ctr++] == 'a' || string[ctr++] == 'e' || string[ctr++] == 'i' || string[ctr++] == 'o' || string[ctr++] == 'u')
    {
        flag1 = true;
    }
    if(string[ctr--] == 'a' || string[ctr--] == 'e' || string[ctr--] == 'i' || string[ctr--] == 'o' || string[ctr--] == 'u')
    {
        flag2 = true;
    }
    if((flag1 == true) && (flag2 == true))
    {
        vowel--;
    }
    return vowel;
}

 
int isvowel(char c)
{
   if(c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')
          return TRUE;
   return FALSE;
}
 
...
...
if( string[ctr] == 'y' )
{
   if( !isvowel(strin[ctr-1]) && !isvowel(strin[ctr+1]) 
   {
          // y is a vowel
   }
}